JP5983582B2 - Measuring position determining method and measuring position determining apparatus for convex LP steel plate - Google Patents

Description

  The present invention relates to a measuring position determining method and a measuring position determining apparatus for a convex LP steel sheet for determining a measuring position for cutting out a convex LP steel sheet from a material to be rolled.

  LP (Longitudinally Profiled) steel plates whose thickness changes in the plate length direction can be used as general structural members with a cross-sectional shape corresponding to the stress distribution in the plate length direction, reducing material weight and man-hours for processing parts It has a great effect in terms of etc. The LP steel sheet cannot determine the measurement position from the material to be rolled by only the planar shape of the material to be rolled, as in the case of the steel sheet whose thickness does not change in the plate length direction, and determines the measurement position from the material to be rolled. In this case, the thickness of the material to be rolled must be taken into consideration.

  From such a background, conventionally, there has been proposed a method for determining the measuring position of the LP steel plate from the material to be rolled in consideration of the thickness of the material to be rolled. Specifically, Patent Document 1 divides the measurement margin range of the LP steel plate from the material to be rolled, and the plate thickness measurement values and the LP steel plate at a plurality of measurement points within the measurement effective range starting from the division point. The sum of the squares of the differences from the nominal thickness is calculated as an evaluation value, and a measuring position determination method for the LP steel sheet is described in which the dividing point where the evaluation value is the smallest is the tip position for cutting the LP steel sheet from the rolled material. .

Japanese Patent No. 4323736

  However, when the measuring position determination method described in Patent Document 1 is applied to the measuring process of a convex LP steel plate having a convex portion in the plate length direction, the following problems occur. Hereinafter, with reference to FIG. 5 thru | or FIG. 7, the problem at the time of applying the measuring position determination method of patent document 1 to the measuring process of a convex LP steel plate is demonstrated.

  FIG. 5 illustrates the material to be rolled when the length ΔD1 between the top taper portion and the bottom taper portion of the material to be rolled and the length ΔD2 between the top taper portion and the bottom taper portion of the convex LP steel plate are substantially equal. It is a figure which shows an example of the plate | board thickness profile of the plate length direction of a convex LP steel plate. FIG. 6 shows the material to be rolled and the convex shape when the length ΔD1 between the top taper portion and the bottom taper portion of the material to be rolled is longer than the length ΔD2 between the top taper portion and the bottom taper portion of the convex LP steel sheet. It is a figure which shows an example of the plate | board thickness profile of the plate length direction of LP steel plate.

  5 and 6, the circular plots indicate the plate thickness profiles in the plate length direction of the material to be rolled measured at a predetermined pitch by a plate thickness meter, and the lines L1, L2, and L3 are the plate lengths of the convex LP steel plates, respectively. The profile of the board thickness tolerance upper limit of a direction, the target board thickness, and the board thickness tolerance lower limit is shown. In addition, the double-headed arrow described between the plate thickness profile of the material to be rolled and the profile L2 of the target plate thickness indicates the plate thickness measurement value calculated by the measuring position determination method described in Patent Document 1 and the convex LP steel plate. The difference from the nominal thickness is shown. Further, in this specification, the top taper portion means an inclined region where the plate thickness increases from the front end side (top side) to the tail end side (bottom side) in the plate length direction. It means an inclined region in which the plate thickness decreases from the front end side to the tail end side in the plate length direction.

  In the measuring position determination method described in Patent Document 1, the length ΔD1 between the top taper portion and the bottom taper portion of the material to be rolled and the length ΔD2 between the top taper portion and the bottom taper portion of the convex LP steel sheet are substantially equal. If equal, the evaluation value is compared while changing the tip position of the convex LP steel plate to be measured from the material to be rolled, so that the convex shape has a thickness profile close to the target thickness profile L2, and is less likely to cause a tolerance deviation. LP steel sheet can be measured.

  Specifically, at the tip position (product tip position) of the convex LP steel plate shown in FIG. 5A, the difference between the thickness of the material to be rolled and the target thickness is large at both the top taper portion and the bottom taper portion. For this reason, the evaluation value becomes large. On the other hand, at the product front end position shown in FIG. 5B, the evaluation value is small because the difference between the plate thickness of the material to be rolled and the target plate thickness at the top taper portion and the bottom taper portion is small. Accordingly, by determining the measuring position of the convex LP steel plate to the position shown in FIG. 5B, the convex LP steel plate having a plate thickness profile close to the target plate thickness profile L2 and hardly causing a tolerance deviation is measured. can do.

  However, according to the measuring position determination method described in Patent Document 1, the length ΔD1 between the top taper portion and the bottom taper portion of the material to be rolled is the length between the top taper portion and the bottom taper portion of the convex LP steel plate. When it is longer than ΔD2, a convex LP steel sheet that is likely to be out of tolerance may be measured. Specifically, in this case, the plate thickness of the material to be rolled at the top taper portion and the bottom taper portion is larger than the target plate thickness. In such a case, as shown in FIG. 6A, the measurement position of the convex LP steel plate is calculated when the plate thickness of the top taper portion of the material to be rolled is set to a position near the plate thickness tolerance upper limit value. As shown in FIG. 6 (b), the evaluation value and the evaluation value calculated when the measurement position of the convex LP steel sheet is set to a position where the thickness of the bottom taper portion of the material to be rolled is near the plate thickness tolerance upper limit value. There is no difference between them as shown in FIGS. 5 (a) and 5 (b).

  For this reason, the evaluation value in the case shown in FIG. 6A is the smallest due to a slight difference in the thickness of the material to be rolled in the top taper portion and the bottom taper portion, or the evaluation value in the case shown in FIG. It becomes the smallest. Then, when the measurement position of the convex LP steel sheet is determined to be a position where the thickness of the material to be rolled is close to the upper limit of tolerance, the tip extra length or tail end extra length in the cutting process of the tip extra length or tail end extra length in the lower process When the cutting position of the tail end extra length is displaced, the convex LP steel plate cannot be shipped as a product because the plate thickness of the convex LP steel plate deviates from the tolerance.

  Furthermore, according to the measuring position determination method described in Patent Document 1, when the inclination angle of the top taper portion or the bottom taper portion is large, the following problems occur. Hereinafter, with reference to FIG. 7, a problem when the inclination angle of the top taper portion or the bottom taper portion is large will be described. FIG. 7 is a diagram showing a change in the distance between the plate thickness of the material to be rolled and the plate thickness tolerance upper limit in the plate length direction accompanying the change in the inclination angle of the top taper portion. When the inclination angle of the top taper part or bottom taper part is large, even if the plate thickness of the material to be rolled is sufficiently far from the plate thickness tolerance upper limit value in the plate thickness direction, the plate thickness of the material to be rolled is May approach the upper limit of thickness tolerance.

  Specifically, in FIGS. 7A and 7B, assuming that the plate thickness measurement points A and B in the plate thickness direction and the plate thickness difference ΔDL between the plate thickness tolerance upper limit values are equal, FIG. As shown in a), when the inclination angle of the top taper portion is gentle, the distance ΔDL1 between the plate thickness measurement point A and the tolerance upper limit L1 in the plate length direction is relatively large. However, as shown in FIG. 7B, when the inclination angle of the top taper portion is steep, the distance ΔDL2 between the plate thickness measurement point B and the plate thickness tolerance upper limit in the plate length direction is the distance ΔDL1. Shorter than.

  That is, when the inclination angle of the top taper part or the bottom taper part is steep, even if the distance between the plate thickness of the material to be rolled and the plate thickness tolerance upper limit in the plate thickness direction is long, the plate length direction The distance between the plate thickness of the material to be rolled and the plate thickness tolerance upper limit value may be shortened. For this reason, when the measuring position of the convex LP steel sheet is determined based on the difference between the measured thickness and the nominal thickness in the thickness direction as in the measuring position determining method described in Patent Document 1, the thickness of the material to be rolled is determined. If an error occurs between the command and the actual result in the cutting process of the measurement error, the tip margin and the tail margin, the thickness of the measured convex LP steel plate exceeds the tolerance upper limit, so-called tolerance deviation May occur.

  In order to solve such a problem, the material to be rolled is turned to a maintenance yard without performing a cutting process, and the total thickness of the material to be rolled is measured manually using a dial gauge or the like, and the tip margin is removed. A method is conceivable in which the tip end tail length and tail end surplus length are cut by gas cutting after re-determining the length and tail end surplus length. However, when this method is used, much labor and time are required, and the manufacturing cost of the convex LP steel sheet increases.

  The present invention has been made in view of the above, and its purpose is to determine the measuring position of a convex LP steel sheet capable of measuring a convex LP steel sheet that does not require much labor and time and is unlikely to cause a tolerance deviation. It is to provide a method and a measuring position determining apparatus.

  A measuring position determining method for a convex LP steel sheet according to the present invention is a measuring position determining method for a convex LP steel sheet for determining a measuring position for cutting out a convex LP steel sheet from a material to be rolled. About the measuring position, the distance between the thickness of the material to be rolled and the thickness tolerance of the convex LP steel plate in the plate length direction of the top taper part where the plate thickness increases from the front end side to the tail end side in the plate length direction The step of calculating the average value of the top side average value and the measurement position of the plurality of convex LP steel plates in the plate length direction of the bottom taper portion where the plate thickness decreases from the tail end side to the tip side in the plate length direction Calculating the average value of the distance between the sheet thickness of the material to be rolled and the sheet thickness tolerance of the convex LP steel sheet as the bottom average value, and among the measuring positions of the plurality of convex LP steel sheets, the top average value And the bottom average value are almost equal. Determining the position to measuring position for cutting the convex LP plates from the rolled material, characterized in that it comprises a.

Measuring the position determination apparatus convex LP steel sheet according to the present invention includes an information processing apparatus, a measurement position determination device convex LP plates for determining the measuring position for cutting the convex LP plates from the rolled material, wherein The information processing apparatus has a thickness and a convexity of the material to be rolled in the plate length direction of the top taper portion where the plate thickness increases from the front end side to the tail end side in the plate length direction at the measuring positions of the plurality of convex LP steel plates. It means for calculating an average value of the distance between the plate thickness tolerance type LP plates as the top side average value, for measuring positions of a plurality of convex LP plates, toward the tip side from the tail end side of Itacho direction plate Means for calculating the average value of the distance between the plate thickness of the material to be rolled and the plate thickness tolerance of the convex LP steel sheet in the plate length direction of the bottom taper portion where the thickness is reduced , and a plurality of convex LPs Among the measuring positions of the steel sheet, the top side average Characterized in that it functions as a means of determining the said bottom-side average value and is substantially equal measurement position in the measurements position for cutting the convex LP plates from the rolled material.

  According to the measuring position determining method and measuring position determining apparatus for a convex LP steel sheet according to the present invention, it is possible to measure a convex LP steel sheet that is less likely to be out of tolerance without requiring much labor and time.

FIG. 1 is a schematic diagram showing a configuration of a shear line to which a method for determining a measuring position of a convex LP steel plate according to an embodiment of the present invention is applied. FIG. 2 is an explanatory diagram for explaining a measuring position determination method for a convex LP steel plate according to an embodiment of the present invention. FIG. 3 is an explanatory diagram for explaining a measuring position determination method for a convex LP steel plate according to an embodiment of the present invention. FIG. 4 is an explanatory diagram for explaining a measuring position determination method for a convex LP steel plate according to an embodiment of the present invention. FIG. 5 shows the material to be rolled and the convex LP steel plate when the length between the top taper portion and the bottom taper portion of the material to be rolled is substantially equal to the length between the top taper portion and the bottom taper portion of the convex LP steel plate. It is a figure which shows an example of the plate | board thickness profile of the plate | board length direction. FIG. 6 shows the rolling material and the convex LP steel plate when the length between the top taper portion and the bottom taper portion of the material to be rolled is longer than the length between the top taper portion and the bottom taper portion of the convex LP steel plate. It is a figure which shows an example of the plate | board thickness profile of a board length direction. FIG. 7 is a diagram showing a change in the distance between the thickness of the material to be rolled and the thickness tolerance upper limit profile in the plate length direction in accordance with the change in the inclination angle of the top taper portion.

  Hereinafter, a method for determining a measuring position of a convex LP steel sheet according to an embodiment of the present invention will be described with reference to the drawings.

[Configuration of shear line]
First, with reference to FIG. 1, the structure of the shear line to which the measuring position determination method of the convex LP steel plate which is one Embodiment of this invention is applied is demonstrated.

  FIG. 1 is a schematic diagram showing a configuration of a shear line to which a method for determining a measuring position of a convex LP steel plate according to an embodiment of the present invention is applied. As shown to Fig.1 (a), the shear line 1 to which the measuring position determination method of the convex LP steel plate which is one Embodiment of this invention is applied is the crop cutting device 2, the side crop cutting device 3, and a cold plate. A thickness gauge 4 and a finish cutting device 5 are provided.

  As shown in FIG. 1 (b), in this shear line 1, the crop cutting device 2 first cuts the crops C 1 and C 2 on the front end side and tail end side of the material P rolled by the rolling mill. The side crop cutting device 3 cuts the side crops S1 and S2 of the material P to be rolled. Next, the cold plate thickness meter 4 measures the plate thickness in the plate length direction of the material P to be rolled at a predetermined pitch such as a 100 mm pitch. Then, the finishing cutting device 5 uses an information processing device such as a process computer based on the measurement position of the convex LP steel plate S determined based on the measurement result of the cold plate thickness gauge 4 and the leading edge TS of the material P to be rolled. And the convex LP steel plate S is manufactured by cutting the tail end surplus length BS.

  Thereafter, the convex LP steel sheet S is transported to the shipping yard and shipped from the shipping yard toward the customer. If it is determined that the rolled material P has a thickness abnormality based on the measurement result of the cold sheet thickness meter 4, the rolled material P is turned to the maintenance yard without performing the cutting process by the finish cutting device 5. Sometimes. In the maintenance yard, the total thickness of the material to be rolled P is manually measured using a dial gauge or the like, and the tip end length and tail end length of the material to be rolled P are determined again, and then the tip by gas cutting. The extra length and tail end extra length are cut.

[Measurement method of measuring position of convex LP steel sheet]
Next, with reference to FIG. 2 thru | or FIG. 4, the measuring position determination method of the convex LP steel plate which is one Embodiment of this invention is demonstrated.

  2 to 4 are explanatory diagrams for explaining a measuring position determination method for a convex LP steel plate according to an embodiment of the present invention. In the figure, the circular plot shows the plate thickness profile in the plate length direction of the material P to be rolled measured by the cold plate thickness meter 4, and the lines L1, L2, and L3 are respectively in the plate length direction of the convex LP steel plate S. A profile of a plate thickness tolerance upper limit value, a target plate thickness, and a plate thickness tolerance lower limit value is shown.

  In the measuring position determining method for a convex LP steel sheet according to an embodiment of the present invention, first, the information processing apparatus executes the following processing for a plurality of measuring positions of the convex LP steel sheet. In the present embodiment, the information processing apparatus is configured so that the tail end position of the material to be rolled is a convex LP steel plate from the state in which the tip position of the material to be rolled and the tip position (product tip position) of the convex LP steel plate are matched. The position of the material to be rolled is shifted at a predetermined pitch such as an interval of 20 mm until it coincides with the tail end position, and the following processing is executed for each position.

  That is, first, the information processing apparatus performs each thickness measurement point A (i) (plate thickness measurement start point mt ≦ i ≦ plate thickness measurement end point nt) corresponding to the position of the top taper portion of the convex LP steel plate. The distance ΔLau (i) (see FIG. 2) to the plate thickness tolerance upper limit profile L1 in the plate length direction is calculated. Similarly, the information processing apparatus determines the plate length for each plate thickness measurement point A (j) (plate thickness measurement start point mb ≦ j ≦ plate thickness measurement end point nb) corresponding to the position of the bottom taper portion of the convex LP steel plate. A distance ΔLau (j) (see FIG. 2) to the plate thickness tolerance upper limit profile L1 in the direction is calculated.

  Specifically, the information processing apparatus sets the inclination of the top taper portion to α (> 0) and sets the distance ΔTau (i) from the plate thickness measurement point A (i) to the plate thickness tolerance upper limit profile L1 in the plate length direction. The distance ΔLau (i) from the plate thickness measurement point A (i) in the plate length direction to the plate thickness tolerance upper limit profile L1 is calculated using the following formula (1). Similarly, the information processing apparatus uses β (<0) as the inclination of the bottom taper portion, and the distance ΔTau (j) from the plate thickness measurement point A (j) to the plate thickness tolerance upper limit profile L1 in the plate length direction, The distance ΔLau (j) from the plate thickness measurement point A (j) in the plate length direction to the plate thickness tolerance upper limit profile L1 is calculated by the following mathematical formula (2).

  When the above-described processing is completed for all the plate thickness measurement points corresponding to the top taper portion and the bottom taper portion of the convex LP steel plate, the information processing apparatus then calculates the following formulas (3) and (4). The average value ΔLautop of the distance ΔLau (i) and the average value ΔLaubot of the distance ΔLau (j) are calculated. The average value ΔLatop and the average value ΔLaubot respectively correspond to the top side average value and the bottom side average value according to the present invention. In Equations (3) and (4), mt is a plate thickness measurement start point corresponding to the top tapered portion of the convex LP steel plate, nt is a plate thickness measurement end point corresponding to the top tapered portion of the convex LP steel plate, mb represents a plate thickness measurement start point corresponding to the bottom taper portion of the convex LP steel plate, and nb represents a plate thickness measurement end point corresponding to the bottom taper portion of the convex LP steel plate.

  Next, the information processing apparatus uses the convex LP steel plate from the rolled material to select the measuring position where the average value ΔLautop and the average value ΔLabot are substantially equal, as shown in FIG. 3, from the plurality of measuring positions of the convex LP steel plate. Determine the measurement position to cut out. And finally, the information processing device calculates the leading end length and tail end surplus length of the material to be rolled based on the determined measuring position, and information on the calculated leading end surplus length and tail end surplus length is used as the finishing cutting device 5. Output to. Thereafter, the finish cutting device 5 manufactures the convex LP steel sheet by cutting the leading end length and tail end surplus length of the material to be rolled.

  As is clear from the above description, in the measuring position determination method of the convex LP steel plate according to one embodiment of the present invention, the information processing apparatus is configured to measure the top taper portion and the bottom taper portion with respect to the measuring positions of the plurality of convex LP steel plates. The average value ΔLatop, ΔLaubot of the distance between the thickness of the rolled material in the plate length direction and the plate thickness tolerance upper limit value of the convex LP steel plate is calculated, and the average among the measuring positions of the plurality of convex LP steel plates The measurement position where the values ΔLautop and ΔLaubot are substantially equal is determined as the measurement position for cutting out the convex LP steel plate from the material to be rolled. That is, in the measuring position determination method of the convex LP steel plate according to an embodiment of the present invention, the convex LP steel plate is convex in consideration of the distance between the thickness of the material to be rolled and the thickness tolerance of the convex LP steel plate in the plate length direction. Determine the measuring position of the type LP steel plate. Accordingly, it is possible to measure the convex LP steel sheet that does not easily cause a tolerance deviation without requiring much labor and time.

  In the above description, the measurement position of the convex LP steel plate is determined based on the distance from the plate thickness measurement point in the plate length direction to the plate thickness tolerance upper limit profile L1. However, as shown in FIG. 4, when the length between the top taper portion and the bottom taper portion of the material to be rolled is shorter than the length between the top taper portion and the bottom taper portion of the convex LP steel plate, Since the plate thickness of the top taper portion and the bottom taper portion of the rolled material becomes thinner than the target plate thickness, it is also necessary to consider the distance between the plate thickness measurement point in the plate length direction and the plate thickness tolerance lower limit profile L3. .

  Therefore, when the length between the top taper portion and the bottom taper portion of the material to be rolled is shorter than the length between the top taper portion and the bottom taper portion of the convex LP steel plate, the information processing apparatus is By the same method, the distance from the plate thickness measurement point A (i) and the plate thickness measurement point A (j) in the plate length direction to the plate thickness tolerance lower limit profile L3 is calculated, and a convex shape is calculated based on the calculated distance. It is desirable to determine the measurement position of the LP steel sheet.

  Specifically, in this case, first, the information processing apparatus determines the plate length at each of the thickness measurement points A (i) and A (j) corresponding to the positions of the top taper portion and the bottom taper portion of the convex LP steel plate. The distances ΔLad (i) and ΔLad (j) (see FIG. 4) to the plate thickness tolerance lower limit profile L3 in the direction are calculated. Next, the information processing apparatus calculates an average value of the distances ΔLad (i) and ΔLad (j), and selects a measuring position at which the calculated average value is substantially equal from a plurality of measuring positions of the convex LP steel plate. The measurement position is determined by cutting out the convex LP steel plate from the material to be rolled.

  The embodiment to which the invention made by the present inventors is applied has been described above, but the present invention is not limited by the description and the drawings that constitute a part of the disclosure of the present invention. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Shearing line 2 Crop cutting device 3 Side crop cutting device 4 Cold sheet thickness meter 5 Finish cutting device

Claims (2)

A measuring position determining method for a convex LP steel sheet for determining a measuring position for cutting out a convex LP steel sheet from a rolled material,
Regarding the measuring positions of a plurality of convex LP steel plates, the thickness of the material to be rolled in the plate length direction of the top taper portion where the plate thickness increases from the front end side to the tail end side in the plate length direction and the plate of the convex LP steel plate Calculating an average value of distances between thickness tolerances as a top average value;
Regarding the measuring positions of a plurality of convex LP steel plates, the thickness of the material to be rolled and the thickness of the convex LP steel plates in the plate length direction of the bottom taper portion where the plate thickness decreases from the tail end side to the tip side in the plate length direction. Calculating an average value of distances between tolerances as a bottom average value;
Of the measuring positions of a plurality of convex LP steel plates, determining the measuring position at which the top side average value and the bottom side average value are substantially equal to the measuring position for cutting out the convex LP steel plate from the material to be rolled;
A method for determining a measuring position of a convex LP steel sheet, comprising: A measuring position determining device for a convex LP steel sheet that includes an information processing device and determines a measuring position for cutting out a convex LP steel sheet from a rolled material,
The information processing apparatus has a plate thickness of the material to be rolled in the plate length direction of the top taper portion where the plate thickness increases from the tip side in the plate length direction toward the tail end side for the measuring positions of the plurality of convex LP steel plates. It means for calculating an average value of the distance between the plate thickness tolerance of the convex LP plates as the top side average value, for measuring positions of a plurality of convex LP plates, toward the tip side from the tail end side of Itacho direction Means for calculating the average value of the distance between the sheet thickness of the material to be rolled and the sheet thickness tolerance of the convex LP steel sheet in the plate length direction of the bottom taper portion where the sheet thickness is reduced , and a plurality of convex molds Among the measuring positions of the LP steel sheet, it functions as means for determining a measuring position at which the top side average value and the bottom side average value are substantially equal to a measuring position for cutting out the convex LP steel sheet from the rolled material. Measuring position of convex LP steel plate Apparatus.

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